Higher Biology Unit 2. KA4: Metabolism in C&R

What are conformers dependent on for their internal environment?

• Their metabolic rate

• The external environment

• Their physiological mechanisms

• Their ability to adapt

What is a disadvantage of being a conformer?

• High metabolic costs

• Restricted to a narrow ecological niche

• Ability to live in a wide range of ecological niches

• High adaptability to environmental changes

What do regulators use to maintain their internal environment?

• Physiological mechanisms of conformers

• Behavioral responses

• Adaptation to the external environment

• Energy from their metabolism

What is homeostasis?

• A system of receptors, messages, and effectors

• The maintenance of a constant internal environment

• The process of adapting to the external environment

• The process of increasing metabolic rate

What principle is homeostasis controlled by?

• Negative feedback

• Positive feedback

• Physiological adaptation

• Metabolic control

What part of the brain is involved in thermoregulation?

• Hypothalamus

• Cerebrum

• Cerebellum

• Medulla

What happens during vasodilation?

• Blood capillaries constrict

• Body temperature decreases

• Blood capillaries dilate, increasing blood flow to the skin

• Metabolic rate decreases

What is the purpose of shivering?

• To cool down the body

• To increase metabolic rate

• To generate heat through involuntary muscle contractions

• To decrease blood flow to the skin

What does vasoconstriction do?

• Decreases blood flow to the skin to retain heat

• Generates heat through muscle contractions

• Increases blood flow to the skin

• Evaporates water to cool the skin

What is the set point in the context of homeostasis?

• The lowest metabolic rate

• The optimal internal temperature

• The external temperature

• The highest metabolic cost